I am going to say yes, but I will find out officially I guess. The RCMP bulletin referred to is most likely the bulletin on the LAR and other pistol mags. They are stamped for the LAR-15 pistol and are pinned to 10. I cannot see how this is any different than a "high-capacity" glock mag that is pinned to 10rds.

Does not really answer the question. The links you posted don’t work. It looks like the files are 2 years old and they don’t apply to these mags. These mags appear to just regular USGI mags which have been pinned to 10 and labelled as pistol. This is probably not legal. Otherwise what’s stopping someone from taking Omaha and pinning them to 10 and leveling them as pistol mags.

It would be useful if vendor can clarify rather than being vague on the legality of these specific mags.

I am going to say yes, but I will find out officially I guess. The RCMP bulletin referred to is most likely the bulletin on the LAR and other pistol mags. They are stamped for the LAR-15 pistol and are pinned to 10. I cannot see how this is any different than a "high-capacity" glock mag that is pinned to 10rds.

Because Glock mags are originally designed for a pistol I.e. Glock but this mag was designed for m16 rifle. It’s a subtle but important technicality